sudomod

I have a power board that was replaced by Helder with the proper chips, but recently it's started to fail in powering the pi. I checked the connections on the board, the pi GPIO pins, even the wire harness and those are all fine. Powering the pi directly is working, but when using the power board, either with USB-C charging cable or just the battery, the pi starts and the screen flickers white before going black. I'm at the end of my rope here.

Sounds like the battery is not fully charged or might not be seated properly, measure the battery voltage at the battery and the 3d pin from the top on the white connector when you press the power button.

It's working now, but I'm sure it wasn't the battery. I checked the voltage with a multimeter and it was consistently giving 3.7 volts, and the leads were connected too.